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Synopsis of Biological Data on the Spottail Pinfish, Diplodus Holbrooki (Pisces: Sparidae)

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Synopsis of Biological Data on the Spottail Pinfish, Diplodus Holbrooki (Pisces: Sparidae) NOAA Technical Report NMFS 19 Synopsis of Biological Data on the Spottail Pinfish, Diplodus holbrooki (Pisces: Sparidae) George H. Darcy January 1985 FAG Fisheries Synopsis No. 142 U.S. DEPARTMENT OF COMMERCE Malcolm Baldrige, Secretary National Oceanic and Atmospheric Administration John V. Byrne, Administrator National Marine Fisheries Service William G. Gordon, Assistant Administrator for Fisheries The National Marine Fisheries Service (NMFS) does not approve, recom­ mend or endorse any propriety product or proprietary material mentioned in this publication. No reference shall be madeto NMFS, or to this publica­ tion furnished by NMFS, in any advertising or sales promotion which would indicate or imply that NMFS approves, recommends or endorses any proprietary product or proprietary material mentioned herein, or which has as its purpose an intent to cause directly or indirectly the advertised pro­ duct to be used or purchased because of this NMFS publication. CONTENTS Introduction.. 1 1 Identity. .. 1 1.1 Nomenclature . I 1.11 Valid name...... .. .. ) 1.12 Objective synonymy. ......... .. .. ......... 1 1.2 Taxonomy. ..... .................... 1 1.21 Affinities ........................ ............. .. .. 1 1.22 Taxonomic status. ....................................................... 2 1.23 Subspecies ................................................ .. .. 2 1.24 Standard common names, vernacular names . 2 1.3 Morphology. ............................. .......... .. 2 1.31 External morphology. .. ........ 2 *1.32 Cytomorphology *1.33 Protein specificity 2 Distribution ................... 3 2.1 Totalarea .. .. 3 2.2 Differential distribution. ..... 3 2.21 Spawn, larvae, and juveniles . 3 2.22 Adults... 4 2.3 Determinants of distribution changes . 4 2.4 Hybridization. .. 4 3 Bionomics and life history. ............. 4 3.1 Reproduction. ..................... 4 3.11 Sexuality................... 4 3.12 Maturity................... 5 3.13 Mating . 5 3.14 Fertilization . 5 *3.15 Gonads 3.16 Spawning.... 5 3.17 Spawn....... .. 5 3.2 Preadult phase. ................. 5 3.21 Embryonic phase. .................. 5 3.22 Larvae and adolescent phase . 5 3.3 Adult phase. .......................................... 5 3.31 Longevity . 5 3.32 Hardiness... 5 3.33 Competitors..................... 5 3.34 Predators . 6 *3.35 Parasites, diseases, injuries, and abnormalities *3.36 Chemical composition 3.4 Nutrition and growth . 6 3.41 Feeding . 6 3.42 Food.............................................. ................... 6 3.43 Growth rate . 6 3.5 Behavior. .................................................................. .. .. 8 3.51 Migrations and local movements. ........................ 8 3.52 Schooling . 8 3.53 Responses to stimuli . 8 4 Population. ........................................................................... 8 4.1 Structure . 8 4.11 Sex ratio .................................................. 8 *4.12 Age composition 4.13 Size composition.......................................... 8 4.14 Subpopulations . 8 4.2 Abundance and density . 8 4.3 Natality and recruitment __ . 9 4.31 Reproduction rates . 9 4.32 Factors affecting reproduction. ..................................... 9 4.33 Recruitment . 9 *4.4 Mortality and morbidity *4.5 Dynamics of population 4.6 The population in the community and the ecosystem . 9 5 Exploitation. ........................................................ .. 10 5.1 Fishing equipment . 10 5.2 Fishing areas . 10 5.3 Fishing seasons . 10 5.4 Fishing operations and results . 10 iii 5.41 Effort and intensity 10 *5.42 Selectivity 5.43 Catches. 10 6 Protection and management 10 *7 Pond fish culture ... 10 Acknowledgments .. 10 Literature cited .... 10 *No information available. iv Synopsis of Biological Data on the Spottail Pinfish, Diplodus holbrooki (Pisces: Sparidae) GEORGE H. DARCY I ABSTRACT Information on the biology and fishery resources of the spottail pinfish, Diplodus holbrook;, is compiled, reviewed, and analyzed in the FAD species synopsis slyle. INTRODUCTION Diplodus caudill/Clcula. Jordan and Gilbert 1883 (young, not caudimacula of Poey) The spottail pinfish, Diplodus holbrooki, is a common, shallow­ Diplodus holbrookii. Bean 1891 water sparid fish occurring along the southern Atlantic and Gulf of Mexico coasts of the United States. Individuals are especially 1.2 Taxonomy common along the Carolinas and on the west coast of Florida. They are sometimes quite abundant on grassflats and may be 1.21 Affinities among the dominant fish species on natural and artificial reefs, man-made platforms, and jetties. Because of their abundance, Suprageneric spottail pinfish may be ecologically important as forage for larger carnivores; they are among the dominant herbivores in shallow­ Phylum Chordata water grassbeds. Their flesh is of excellent quality, and spottail Class Osteichthyes pinfish probably make up a significant portion of the catch of sub­ Superorder Acanthopterygii sistence fishermen through much of their range. There is no Order Perciformes known directed fishery. This paper summarizes information on Suborder Percoidei this species. Family Sparidae IDENTITY Generic 1.1 Nomenclature The genus Diplodus Rafinesque, Indice d'lttilogia Siciliana 54, 1810, is best represented in the eastern Atlantic Ocean (Jordan 1.11 Valid name and Fesler 1893), though at least three species occur in the western Atlantic (Randall and Vergara R. 1978). Type of the Diplodus holbrooki (Bean 1878) (Fig. I). Also appears as Diplodus genus is Sparus Clnnularis Gmelin (Jordan and Fesler 1893 J. holbrookii (Bean 1878), bearing the original patronym emenda­ Members of the genus are characterized by an ovate, compres­ tion of Bean (e.g., Randall and Vergara R. 1978). sed body with the back notably elevated; broad, strongly flattened, unnotched, incisiform jaw teeth at the front of the mouth; Spottail pinfish, Diplodus holbrooki (Bean 1878: 198), type molariform teeth in several rows; a large, dark blotch on the locality: Charleston, S.C. The name comes from the Greek diploos, caudal peduncle; short gill rakers; about 12 dorsal fin spines: and meaning double. and odonlos, meaning tooth, referring to the two the absence of a procumbent (forward-pointing) spine preceding types of teeth. Named after John Edwards Holbrook, naturalist the dorsal fin (Hildebrand and Schroeder 1928; Randall and and author of "Ichthyology of South Carolina" (Jordan and Fesler Vergara R. 1978). The skull resembles that ofArchosarflus, but the 1893). cavernous or honeycombed structure of the interorbital area is more prominent (Jordan and Fesler 1893). 1.12 Objective synonymy Specific The following synonymy is based on Jordon and Fesler (1893) and Hildebrand and Schroeder (1928): The following species diagnosis is based on Randall and Vergara R. (1978): Body oval, compressed, and very deep, the Sargus holbrookii Bean 1878 body depth contained about 2.2 times in standard length (SL); Diplodus holbrooki. Jordan and Gilbert 1882 snout pointed, lateral profile nearly straight; posterior nostril rounded; mouth moderately developed, maxilla barely reaching to anterior eye margin; both jaws anteriorly with 6 well developed 'Southeast Fisheries Center, National Marine Fisheries Service. NOAA. 75 incisiform teeth; 3 rows of lateral molariform teeth: 17-21 gill Virginia Beach Drive. Miami. FL 33149-1099. rakers on first arch; dorsal fin XII, 13-16, not preceded by a small Figure I.-Adult Diplodus holbrooki. (From Goode 1884, plate 132.) forward-directed spine; longest dorsal spine about 2.5 times in Charleston bream, pin-fish (Goode 1884); jimmy (Goode and Gill head length; anal fin with 13-15 soft rays; pectoral fins long, 1903); spot, pinfish (Jordan and Evermann 1923); spot-tailed pin­ reaching at least to first anal spine when appressed; lateral line fish, sailor's choice (Hildebrand and Schroeder 1928); spot-tail scales 50-61. Steel blue color on back, sides silvery, with a large pinfish (Reid 1954); and spot tail (Springer and Woodburn 1960). black spot anteriorly on caudal peduncle which nearly reaches lower peduncular margin; opercular membrane blackish. 1.3 Morphology Two other species of Diplodus occur in the western Atlantic Ocean-D. argenteus and D. bermudensis. Diplodus holbrooki dif­ 1.31 External morphology fers from D. argenteus (D. argenteus caudimacula of Randall and Vergara R. 1978) in having lower dorsal and anal fins, a shallower The following morphological description is based on Jordan body, fewer lateral lines scales (50-61 vs. 56-65), and a larger JnJ Fesler (1893), Hildebrand and Schroeder (1928), Miller and caudal peduncle spot (extending well below midline in D. Jorgenson (1973), Hoese and Moore (1977), and Randall and holbrooki, only slightly below in D. argenteus) (Randall and Vergara R. (1978). Vergara R. 1978). Diplodus bermudensis has even more lateral line Body elliptical, compressed, and deep (depth about 2.1-2.2 in scales (62-67) and is known only from Bermuda, where D. SL). Dorsal profile regularly rounded; snout pointed, with nearly holbrooki has not been reported (Randall and Vergara R. 1978). straight profile. Head 3.25-3.65 in SL. Eye rather small, 1.75 in preorbital distance, 1.50 in snout, 4.35-4.50 in head. Mouth 1.22 Taxonomic status moderate to large, almost horizontal; maxillary 3.35 in head and not quite reaching anterior margin of eye. Six well developed Diplodus holbrooki is a morphospecies. incisiform teeth at frollt of each jaw, inserted obliquely; 3 rows of molariform teeth laterally. Posterior nostril rounded.
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